Honestly, I'd try surface adjustments first, or simply moving. You're not going to find a different ball that will fit between 2 Versa Maxes that simply have a couple different drillings. That's already a lot of overlap, and if things have to be that perfect for it to work, it doesn't sound to me like it's a ball problem. Sorry if that sounds harsh, but save yourself a couple hundred bucks and try out some other options.